:root {
  --ink: #07111f;
  --ink-soft: #14253a;
  --paper: #f4f7f8;
  --paper-bright: #fbfdfd;
  --mist: #dce5e8;
  --muted: #647482;
  --signal: #54d7c3;
  --signal-light: #a8fff0;
  --blue: #6f8fff;
  --line: rgba(7, 17, 31, 0.13);
  --max-width: 1400px;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page-noise {
  position: fixed;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}

.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  right: 0;
  height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  border-bottom: 1px solid transparent;
  transition: background 240ms ease, border-color 240ms ease, backdrop-filter 240ms ease;
}

.site-header.scrolled {
  background: rgba(244, 247, 248, 0.82);
  border-color: var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-weight: 650;
  letter-spacing: 0.08em;
}

.brand-mark,
.footer-mark {
  width: 34px;
  height: 34px;
  display: grid;
  align-content: center;
  gap: 4px;
  padding: 7px;
  background: var(--ink);
  border-radius: 50%;
}

.brand-mark i,
.footer-mark i {
  display: block;
  height: 2px;
  border-radius: 999px;
  background: var(--signal);
}

.brand-mark i:nth-child(2),
.footer-mark i:nth-child(2) {
  width: 66%;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.6rem, 3vw, 3.4rem);
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.site-nav a {
  position: relative;
  padding: 0.4rem 0;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transition: right 220ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  right: 0;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 0;
  background: transparent;
  padding: 12px 8px;
}

.menu-toggle span:not(.sr-only) {
  display: block;
  width: 100%;
  height: 1px;
  margin: 6px 0;
  background: currentColor;
  transition: transform 220ms ease;
}

.hero {
  position: relative;
  min-height: min(820px, 100svh);
  padding: 122px var(--gutter) 64px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(7, 17, 31, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(7, 17, 31, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 78% 42%, rgba(84, 215, 195, 0.12), transparent 34%),
    var(--paper);
  background-size: 80px 80px, 80px 80px, auto, auto;
}

.hero::after {
  content: "";
  position: absolute;
  width: 42vw;
  height: 42vw;
  min-width: 420px;
  min-height: 420px;
  right: -18vw;
  top: -20vw;
  border: 1px solid rgba(7, 17, 31, 0.08);
  border-radius: 50%;
}

.hero-grid {
  width: min(100%, var(--max-width));
  min-height: calc(min(820px, 100svh) - 186px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(500px, 0.92fr);
  align-items: center;
  gap: clamp(3.5rem, 5vw, 5.5rem);
}

.eyebrow,
.section-label {
  margin: 0 0 2rem;
  font-size: 0.72rem;
  line-height: 1.4;
  letter-spacing: 0.18em;
  font-weight: 650;
  color: var(--muted);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.eyebrow span {
  width: 32px;
  height: 1px;
  background: var(--signal);
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(4rem, 5.2vw, 6.1rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.065em;
  word-break: keep-all;
}

.hero-line {
  display: block;
  white-space: nowrap;
}

.hero h1 em,
.manifesto h2 .outline {
  font-style: normal;
  color: transparent;
  -webkit-text-stroke: 1.25px var(--ink);
}

.hero-lead {
  max-width: 31rem;
  margin: 2.15rem 0 2.4rem;
  color: #455563;
  font-size: clamp(1rem, 1.2vw, 1.12rem);
  line-height: 1.8;
  text-wrap: pretty;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 1.2rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--ink);
  font-size: 0.93rem;
  font-weight: 600;
}

.text-link span {
  transition: transform 220ms ease;
}

.text-link:hover span {
  transform: translate(4px, 4px);
}

.signal-field {
  position: relative;
  padding: 1.3rem;
  color: #dce8ec;
  background: var(--ink);
  border-radius: 2px;
  box-shadow: 0 34px 72px rgba(7, 17, 31, 0.15);
  overflow: hidden;
}

.signal-field::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, transparent, black 18%, black 82%, transparent);
}

.signal-meta,
.signal-footer {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: #8293a1;
  font-size: 0.61rem;
  letter-spacing: 0.13em;
}

.live-indicator {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.live-indicator i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 5px rgba(84, 215, 195, 0.12);
  animation: signalPulse 2.4s ease-in-out infinite;
}

.signal-map {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  display: block;
}

.orbit {
  fill: none;
  stroke: rgba(196, 219, 223, 0.13);
  stroke-width: 1;
  stroke-dasharray: 2 9;
  transform-origin: 320px 255px;
}

.orbit-one { animation: orbitSpin 38s linear infinite; }
.orbit-two { animation: orbitSpin 24s linear infinite reverse; }
.orbit-three { stroke-dasharray: 1 14; animation: orbitSpin 52s linear infinite; }

.flow-lines path {
  fill: none;
  stroke: url(#lineFlow);
  stroke-width: 1.3;
  stroke-dasharray: 5 8;
  animation: dashFlow 10s linear infinite;
}

.source-node circle {
  fill: var(--ink);
  stroke: #68e0cf;
  stroke-width: 1.5;
}

.source-node text {
  fill: #aebdc5;
  font-size: 12px;
  letter-spacing: 0.12em;
}

.core-node circle:first-child {
  fill: rgba(84, 215, 195, 0.05);
  stroke: rgba(84, 215, 195, 0.45);
}

.core-node circle:nth-child(2) {
  fill: #0d2030;
  stroke: #68e0cf;
  stroke-width: 1.5;
}

.core-node text {
  fill: #eafefd;
  font-size: 18px;
  font-weight: 600;
  text-anchor: middle;
}

.core-node .core-sub {
  fill: #78909d;
  font-size: 5.5px;
  letter-spacing: 0.17em;
}

.satellite circle {
  fill: #6f8fff;
  filter: drop-shadow(0 0 5px rgba(111, 143, 255, 0.8));
}

.signal-footer {
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-index {
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 24px;
  display: flex;
  justify-content: space-between;
  color: #81909a;
  font-size: 0.64rem;
  letter-spacing: 0.14em;
}

.section-shell {
  width: min(100%, calc(var(--max-width) + var(--gutter) * 2));
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.manifesto {
  padding-top: clamp(7rem, 10vw, 9.5rem);
  padding-bottom: clamp(7rem, 10vw, 9.5rem);
}

.manifesto h2 {
  max-width: 1220px;
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(2.5rem, 3.8vw, 3.75rem);
  font-weight: 560;
  line-height: 1.38;
  letter-spacing: -0.045em;
  word-break: keep-all;
}

.manifesto-line {
  display: block;
  white-space: nowrap;
}

.capabilities {
  padding-top: 2rem;
  padding-bottom: clamp(7rem, 12vw, 11rem);
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr minmax(280px, 0.54fr);
  gap: 4rem;
  align-items: end;
  margin-bottom: clamp(3.5rem, 7vw, 6rem);
}

.section-heading h2 {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(2.4rem, 3.5vw, 3.5rem);
  line-height: 1.2;
  font-weight: 560;
  letter-spacing: -0.045em;
  word-break: keep-all;
}

.section-heading > p {
  max-width: 30rem;
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.capability-list {
  border-top: 1px solid var(--line);
}

.capability-item {
  position: relative;
  display: grid;
  grid-template-columns: 80px 0.7fr 1.25fr auto;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
  padding: clamp(2.2rem, 4.5vw, 4rem) 0;
  border-bottom: 1px solid var(--line);
  transition: padding 250ms ease;
}

.capability-item::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--paper-bright);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms ease;
}

.capability-item:hover {
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.capability-item:hover::before {
  transform: scaleX(1);
}

.capability-number,
.capability-code {
  color: #8a99a3;
  font-size: 0.68rem;
  letter-spacing: 0.13em;
}

.capability-item h3 {
  margin: -0.28rem 0 0;
  font-size: clamp(1.5rem, 2vw, 2rem);
  font-weight: 560;
  letter-spacing: -0.025em;
}

.capability-item p {
  max-width: 36rem;
  margin: 0;
  color: #596976;
}

.capability-code {
  text-align: right;
}

.directions {
  padding: clamp(7rem, 12vw, 11rem) 0;
  background: var(--ink);
  color: #f4f7f8;
}

.directions .section-label,
.directions .section-heading > p {
  color: #7e909e;
}

.direction-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.direction-card {
  min-height: 390px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(1.8rem, 4vw, 3rem);
  background: var(--ink);
  transition: background 280ms ease;
}

.direction-card:hover {
  background: #0c1c2c;
}

.direction-card > span {
  color: var(--signal);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.direction-card h3 {
  margin: 0 0 1.25rem;
  font-size: clamp(1.4rem, 1.8vw, 1.9rem);
  font-weight: 540;
  letter-spacing: -0.025em;
}

.direction-card p {
  margin: 0;
  color: #97a8b3;
  line-height: 1.85;
}

.about {
  padding-top: clamp(7rem, 12vw, 11rem);
  padding-bottom: clamp(7rem, 12vw, 11rem);
}

.about-layout {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: clamp(4rem, 10vw, 10rem);
}

.about-aside {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.coordinates {
  padding-top: 4rem;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0.3rem;
}

.coordinates span,
.coordinates small {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
}

.coordinates strong {
  font-size: clamp(1.6rem, 3vw, 2.7rem);
  font-weight: 500;
  letter-spacing: -0.04em;
}

.about-copy h2 {
  margin: 0 0 3rem;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(2.5rem, 4vw, 4rem);
  line-height: 1.25;
  font-weight: 560;
  letter-spacing: -0.045em;
  word-break: keep-all;
}

.about-copy p {
  max-width: 48rem;
  margin: 0 0 1.2rem;
  color: #52626f;
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  line-height: 1.95;
}

.site-footer {
  min-height: 190px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.3rem;
  align-items: center;
  padding: 3.5rem var(--gutter);
  background: #030a12;
  color: #edf4f5;
}

.site-footer strong {
  font-size: 0.95rem;
  font-weight: 520;
}

.site-footer p {
  margin: 0.25rem 0 0;
  color: #71828f;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.site-footer .copyright {
  text-align: right;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 700ms cubic-bezier(0.22, 1, 0.36, 1), transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes signalPulse {
  0%, 100% { opacity: 0.55; transform: scale(0.85); }
  50% { opacity: 1; transform: scale(1.1); }
}

@keyframes orbitSpin {
  to { transform: rotate(360deg); }
}

@keyframes dashFlow {
  to { stroke-dashoffset: -130; }
}

@media (max-width: 1050px) {
  .hero {
    min-height: auto;
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 5rem;
  }

  .hero h1 {
    font-size: clamp(4rem, 9.4vw, 6.2rem);
  }

  .hero-copy {
    padding-top: 3rem;
  }

  .signal-field {
    width: min(100%, 720px);
    margin-left: auto;
  }

  .hero-index {
    display: none;
  }

  .capability-item {
    grid-template-columns: 52px 0.75fr 1.25fr;
  }

  .capability-code {
    display: none;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 70px;
  }

  .brand-name {
    font-size: 0.9rem;
  }

  .menu-toggle {
    display: block;
    z-index: 3;
  }

  .menu-open .menu-toggle span:first-child {
    transform: translateY(3.5px) rotate(45deg);
  }

  .menu-open .menu-toggle span:nth-child(2) {
    transform: translateY(-3.5px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 1.4rem;
    padding: var(--gutter);
    background: rgba(244, 247, 248, 0.98);
    opacity: 0;
    visibility: hidden;
    transition: opacity 220ms ease, visibility 220ms ease;
  }

  .menu-open .site-nav {
    opacity: 1;
    visibility: visible;
  }

  .site-nav a {
    font-size: 2rem;
    font-weight: 500;
    letter-spacing: -0.04em;
  }

  .hero {
    padding-top: 112px;
    padding-bottom: 4.5rem;
    background-size: 54px 54px, 54px 54px, auto, auto;
  }

  .hero-grid {
    gap: 3.8rem;
  }

  .hero-copy {
    padding-top: 1rem;
  }

  .hero h1 {
    font-size: clamp(3.25rem, 16vw, 5.3rem);
    line-height: 1.02;
  }

  .hero-line,
  .manifesto-line {
    white-space: normal;
  }

  .eyebrow {
    font-size: 0.62rem;
    letter-spacing: 0.12em;
  }

  .signal-field {
    padding: 1rem;
  }

  .signal-map {
    margin: 0.7rem 0;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }

  .manifesto h2 {
    font-size: clamp(2.15rem, 10vw, 3.4rem);
    line-height: 1.4;
  }

  .capability-item {
    grid-template-columns: 40px 1fr;
    gap: 1rem;
  }

  .capability-item p {
    grid-column: 2;
  }

  .capability-item:hover {
    padding-left: 0;
    padding-right: 0;
  }

  .direction-grid {
    grid-template-columns: 1fr;
  }

  .direction-card {
    min-height: 330px;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 4rem;
  }

  .about-aside {
    gap: 3rem;
  }

  .coordinates {
    padding-top: 2rem;
  }

  .site-footer {
    grid-template-columns: auto 1fr;
  }

  .site-footer .copyright {
    grid-column: 1 / -1;
    text-align: left;
    margin-top: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}